[Unit]
Description=Matrix Telegram Bridge
After=matrix-synapse.service

[Service]
Type=simple
User=__APP__
Group=__APP__
WorkingDirectory=__INSTALL_DIR__/
ExecStart=__INSTALL_DIR__/bin/python3 -m mautrix_telegram

# Optional hardening to improve security
ReadWritePaths=__INSTALL_DIR__/ /var/log/__APP__
NoNewPrivileges=yes
MemoryDenyWriteExecute=true
PrivateDevices=yes
PrivateTmp=yes
ProtectHome=yes
ProtectSystem=strict
ProtectControlGroups=true
RestrictSUIDSGID=true
RestrictRealtime=true
LockPersonality=true
ProtectKernelLogs=true
ProtectKernelTunables=true
ProtectHostname=true
ProtectKernelModules=true
PrivateUsers=true
ProtectClock=true
SystemCallArchitectures=native
SystemCallErrorNumber=EPERM
SystemCallFilter=@system-service

# Denying access to capabilities that should not be relevant for webapps
# Doc: https://man7.org/linux/man-pages/man7/capabilities.7.html
CapabilityBoundingSet=~CAP_RAWIO CAP_MKNOD
CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
CapabilityBoundingSet=~CAP_SYS_BOOT CAP_SYS_TIME CAP_SYS_MODULE CAP_SYS_PACCT
CapabilityBoundingSet=~CAP_LEASE CAP_LINUX_IMMUTABLE CAP_IPC_LOCK
CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_WAKE_ALARM
CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG
CapabilityBoundingSet=~CAP_MAC_ADMIN CAP_MAC_OVERRIDE
CapabilityBoundingSet=~CAP_NET_ADMIN CAP_NET_BROADCAST CAP_NET_RAW
CapabilityBoundingSet=~CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_SYSLOG

[Install]
WantedBy=multi-user.target